/*
Copyright 2010 GHI Electronics LLC
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. 
*/

using System;
using Microsoft.SPOT.Hardware;

namespace GHIElectronics.NETMF.FEZ
{
    public static partial class FEZ_Components
    {
        #region Nested type: Button

        public class Button : IDisposable
        {
            #region Delegates

            public delegate void ButtonPressEventHandler(FEZ_Pin.Interrupt pin, ButtonState state);

            #endregion

            #region ButtonState enum

            public enum ButtonState : byte
            {
                NotPressed = 0,
                Pressed = 1,
            }

            #endregion

            private readonly InputPort button;

            public Button(FEZ_Pin.Digital pin)
            {
                button = new InputPort((Cpu.Pin) pin, false, Port.ResistorMode.PullUp);
            }

            public Button(FEZ_Pin.Interrupt pin)
            {
                button = new InterruptPort((Cpu.Pin) pin, true, Port.ResistorMode.PullUp,
                                           Port.InterruptMode.InterruptEdgeBoth);
                button.OnInterrupt += OnInterrupt;
            }

            #region IDisposable Members

            public void Dispose()
            {
                button.Dispose();
            }

            #endregion

            private void OnInterrupt(uint data1, uint data2, DateTime time)
            {
                ButtonState state = (data2 == 0) ? ButtonState.Pressed : ButtonState.NotPressed;
                ButtonPressEvent((FEZ_Pin.Interrupt) data1, state);
            }

            public ButtonState GetState()
            {
                return (button.Read() == false) ? ButtonState.Pressed : ButtonState.NotPressed;
            }

            public event ButtonPressEventHandler ButtonPressEvent = delegate { };
        }

        #endregion
    }
}